URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [drivers/] [block/] [dtc2278.c] - Rev 1765
Compare with Previous | Blame | View Log
/* * linux/drivers/block/dtc2278.c Version 0.02 Feb 10, 1996 * * Copyright (C) 1996 Linus Torvalds & author (see below) */ #undef REALLY_SLOW_IO /* most systems can safely undef this */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/timer.h> #include <linux/mm.h> #include <linux/ioport.h> #include <linux/blkdev.h> #include <linux/hdreg.h> #include <asm/io.h> #include "ide.h" #include "ide_modes.h" /* * Changing this #undef to #define may solve start up problems in some systems. */ #undef ALWAYS_SET_DTC2278_PIO_MODE /* * From: andy@cercle.cts.com (Dyan Wile) * * Below is a patch for DTC-2278 - alike software-programmable controllers * The code enables the secondary IDE controller and the PIO4 (3?) timings on * the primary (EIDE). You may probably have to enable the 32-bit support to * get the full speed. You better get the disk interrupts disabled ( hdparm -u0 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my * filesystem corrupted with -u1, but under heavy disk load only :-) * * This card is now forced to use the "serialize" feature, * and irq-unmasking is disallowed. If io_32bit is enabled, * it must be done for BOTH drives on each interface. * * This code was written for the DTC2278E, but might work with any of these: * * DTC2278S has only a single IDE interface. * DTC2278D has two IDE interfaces and is otherwise identical to the S version. * DTC2278E also has serial ports and a printer port * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu> * * There may be a fourth controller type. The S and D versions use the * Winbond chip, and I think the E version does also. * */ static void sub22 (char b, char c) { int i; for(i = 0; i < 3; ++i) { inb(0x3f6); outb_p(b,0xb0); inb(0x3f6); outb_p(c,0xb4); inb(0x3f6); if(inb(0xb4) == c) { outb_p(7,0xb0); inb(0x3f6); return; /* success */ } } } static void tune_dtc2278 (ide_drive_t *drive, byte pio) { unsigned long flags; pio = ide_get_best_pio_mode(drive, pio, 4, NULL); if (pio >= 3) { save_flags(flags); cli(); /* * This enables PIO mode4 (3?) on the first interface */ sub22(1,0xc3); sub22(0,0xa0); restore_flags(flags); } else { /* we don't know how to set it back again.. */ } /* * 32bit I/O has to be enabled for *both* drives at the same time. */ drive->io_32bit = 1; HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1; } void init_dtc2278 (void) { unsigned long flags; save_flags(flags); cli(); /* * This enables the second interface */ outb_p(4,0xb0); inb(0x3f6); outb_p(0x20,0xb4); inb(0x3f6); #ifdef ALWAYS_SET_DTC2278_PIO_MODE /* * This enables PIO mode4 (3?) on the first interface * and may solve start-up problems for some people. */ sub22(1,0xc3); sub22(0,0xa0); #endif restore_flags(flags); ide_hwifs[0].serialized = 1; ide_hwifs[1].serialized = 1; ide_hwifs[0].chipset = ide_dtc2278; ide_hwifs[1].chipset = ide_dtc2278; ide_hwifs[0].tuneproc = &tune_dtc2278; ide_hwifs[0].drives[0].no_unmask = 1; ide_hwifs[0].drives[1].no_unmask = 1; ide_hwifs[1].drives[0].no_unmask = 1; ide_hwifs[1].drives[1].no_unmask = 1; }